Fluent Bit is a straightforward tool and to get started with it we need to understand its basic workflow. Consider the following diagram a global overview of it:
Entry point of data. Implemented through Input Plugins, this interface allows to gather or receive data. E.g: log file content, data over TCP, built-in metrics, etc.
Data ingested by an Input interface is tagged, that means that a Tag is assigned and this one is used to determine where the data should be routed based on a match rule.
An output defines a destination for the data. Destinations are handled by output plugins. Note that thanks to the Routing interface, the data can be delivered to multiple destinations.